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Re: Starting a for loop within an if loop [message #57644 is a reply to message #57642]

Wed, 19 December 2007 20:14

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Mat Smith writes:

> I'm trying to write a program with some keywords, so that depending
> upon my mood I can alter what it does.
>
> What I want to do is most of the time just run the program, but I want
> to include an option to do a for loop.
>
> Basically, I need something like:
>
> IF keyword_set(mc) THEN BEGIN
> FOR i=0,n-1 DO BEGIN
> t=d[i]
> ENDIF
>
> and later in the program
>
> IF keyword_set(mc) THEN BEGIN
> ENDFOR
> ENDIF
>
> Thus the rest of the program runs normally with and without the for
> loop (it just uses t).
> However, IDL doesn't understand this - it wants an ENDFOR before the
> ENDIF.
>
> Any thoughts on how I can get around this? It's entirely possible that
> I'm missing something obvious.

It's possible. Have you taught yourself to program?
Sometimes there can be gaps. :-)

Anyway, I think I would do something like this:

IF keyword_set(mc) THEN endloop = n ELSE endloop = 1
FOR j=0,endloop-1 DO BEGIN
...
ENDFOR

This way, if your keyword is set, you will do the loop n times,
otherwise you will do the loop just once.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Starting a for loop within an if loop By: edward.s.meinel@aero. on Thu, 20 December 2007 07:01
		Re: Starting a for loop within an if loop By: David Fanning on Thu, 20 December 2007 05:43
		Re: Starting a for loop within an if loop By: Carsten Lechte on Thu, 20 December 2007 03:19
		Re: Starting a for loop within an if loop By: Wox on Thu, 20 December 2007 02:08
		Re: Starting a for loop within an if loop By: Allan Whiteford on Thu, 20 December 2007 01:31
		Re: Starting a for loop within an if loop By: Mat Smith on Wed, 19 December 2007 22:50
		Re: Starting a for loop within an if loop By: Mat Smith on Wed, 19 December 2007 22:15
		Re: Starting a for loop within an if loop By: Mat Smith on Wed, 19 December 2007 22:15
		Re: Starting a for loop within an if loop By: David Fanning on Wed, 19 December 2007 20:14
		Re: Starting a for loop within an if loop By: Carsten Lechte on Fri, 21 December 2007 02:12

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